.container {
    max-width: 800px;
    font-family: "Helvetica Neue", Arial, Helvetica, sans-serif;
    font-size: 16px;
    line-height: 1.6;
    color: #333;
    background-color: #f0f0f0;
    padding: 2rem;
    box-sizing: border-box;
}

.container .form-group {
    margin-bottom: 1rem;
}

.container label {
    display: block;
    font-size: 1.2rem;
    margin-bottom: 0.5rem;
}

.container input {
    display: block;
    width: 100%;
    height: 3rem;
    padding: 0.5rem;
    font-size: 1.2rem;
    border-radius: 0.3rem;
    border: none;
    box-shadow: 0 0.1rem 0.2rem rgba(0, 0, 0, 0.2);
    background-color: #fff;
}

.container textarea {
    display: block;
    width: 100%;
    height: 10rem;
    padding: 0.5rem;
    font-size: 1.2rem;
    border-radius: 0.3rem;
    border: none;
    box-shadow: 0 0.1rem 0.2rem rgba(0, 0, 0, 0.2);
    background-color: #fff;
    resize: none;
}

.container .btn {
    display: inline-block;
    padding: 0.8rem 2.2rem;
    font-size: 1.2rem;
    font-weight: bold;
    color: #fff;
    text-align: center;
    text-decoration: none;
    background-color: #4CAF50;
    border-radius: 0.3rem;
    transition: background-color 0.3s;
    cursor: pointer;
}

.container .btn:hover, .btn:focus {
    background-color: #3e8e41;
}
